The Unable to Add Variable dialog displays when you attempt to add a numeric variable, with no axis expression, to an existing table or when you attempt to create a new table.

Click to add summary statistics to the numeric variable. ee Adding summary statistics to a numeric variable.

Click to launch the Edit Variable dialog and specify the content of variables when they appear in your tables. ee Edit Variable dialog.

Click to launch the Simple Categorization dialog and perform simple, non-linguistic categorization of variables by converting Text, Date or Numeric variables, which cannot be directly used in table tabulation, to Categorical variables. ee Simple categorization.